I have the iPhone and I love my apps! Are you an "app fiend" like me? How about trying the RunKeeper Pro app. It helps track your walking,hiking,biking...anything cardio. The best part (at least for me),is that you can use GPS or do enter your stats in manually,and it breaks down your performance for you.Right down to the very calorie.I It also syncs well with whatever playlists you may have on your if you are running,and it has a trainer that will cut in seamlessly from time to tme to let update you an your run/walk/bike times. The app is free (or was the time I got it),and is available in the iTunes store.You can also find on the runkeeper website ... www.runkeeper.com